Five species occurred with more than 50 individuals, 15 species occurred with fewer than 10 individuals, two as doubletons, and two as singletons. |
The distribution of singletons, doubletons, and other variants among the continents was investigated. |
Of these, 75 are singletons, two are doubletons, and one is present in three sequences. |
A quatraton is inferred either from the presence of two singletons, no doubletons, and no tripletons or from the presence of no singletons, one doubleton, and no tripletons. |